diff --git a/src/osgPresentation/SlideEventHandler.cpp b/src/osgPresentation/SlideEventHandler.cpp
index cb6cb3e53..0ef62cf7a 100644
--- a/src/osgPresentation/SlideEventHandler.cpp
+++ b/src/osgPresentation/SlideEventHandler.cpp
@@ -1305,19 +1305,11 @@ bool SlideEventHandler::selectSlide(int slideNum,int layerNum)
 
     OSG_INFO<<"selectSlide("<<slideNum<<","<<layerNum<<")"<<std::endl;
 
-    if (slideNum>=static_cast<int>(_presentationSwitch->getNumChildren()))
-    {
-        slideNum = LAST_POSITION;
-    }
-
-    if (slideNum<=LAST_POSITION && _presentationSwitch->getNumChildren()>0)
+    if (slideNum<0 || slideNum>=static_cast<int>(_presentationSwitch->getNumChildren()))
     {
         slideNum = _presentationSwitch->getNumChildren()-1;
     }
 
-    if (slideNum>=static_cast<int>(_presentationSwitch->getNumChildren())) return false;
-
-
     osg::Timer_t tick = osg::Timer::instance()->tick();
 
     if (_firstSlideOrLayerChange)
@@ -1408,7 +1400,7 @@ bool SlideEventHandler::selectLayer(int layerNum)
         layerNum = LAST_POSITION;
     }
 
-    if (layerNum<=LAST_POSITION && _slideSwitch->getNumChildren()>0)
+    if (layerNum<0)
     {
         layerNum = _slideSwitch->getNumChildren()-1;
     }